At Mobile World Congress 2012, Texas Instruments was demonstrating a stylus that communicates its distance from a tablet over ultrasonic frequencies. The tablet in this demo has a microphone in each of its four corners, which can pinpoint exactly where the stylus is pointing at the screen, even if you're not touching it. Of course, the stylus also works perfectly well along the two standard planes, but it's particularly cool when you pull back and the model correspondingly zooms out.
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